Chapter 7: Networks, Telecommunications and Mobile TechnologyDefinitions: Telecommunication revolution, Telecommunication systems (Transmission of data over public or private network), Network (A bunch of computers linked together using established standards for the purpose of communication, data exchange and resource sharing), LAN, MAN, WAN, VOIP, VPN, VAN, Networks and Telecommunications1. Network Basics a. LAN: Local, connects computer in close proximity e.g. office building.b. MAN: Metropolitan, city wide networks. c. WAN: Country wide networks. Connects multiple MANs networks. 2. Voice over IP: POTS (circuit switching) Vs. VOIP (Packet switching)a. Uses TCP/IP technology to transmit voice over phone lines.b. More than 10% of all calls in the USc. Companies offering VOIP services include 8x8,skype, vonate, att callVantage, Ooma, your cable company.d. Advantages: Efficient use of existing resources3. VPN: virtual private network uses public telecommunication infrastructure to provide secure access to companies resources4. VAN: private network on private resources5. Network terminology and other components.a. Bandwidth: (Think of it as capacity and not speed e.g. 6 lane vs. 4 lane highway)b. Transmission medium i. Twisted pair – analog 14.4 Kbps-56Kbpsii. Twisted pair – digital telephone 128 Kbps – 1.544 Mbpsiii. Twisted pair – LAN 10Mbps – 100Mbpsiv. Coaxial LAN – 10Mbps – 1Gbpsv. Wireless LAN – 6Mbps – 54Mbpsvi. Microwave WAN – 50Kbps-100Mbpsvii. Satellite –WAN – 50Kbps-100Mbpsviii. Fiber optic-WAN – 100Mbps-100Gbpsix. Bluetooth (type of microwave)– 2.1MbpsMobile Technology1. Business drivers (Advantages Disadvantages e.g. cellular, cordless, wireless, satellite, wimax, Bluetooth)2. Cellular (existing uses vs. future uses e.g. airline, hotel checkins, payments, medical records, dating)a. 1G Analogb. 2G e.g. CDMA, TDMA, GSM Digital circuit switchingc. 3G Wideband CDMA packet switchingd. 4G W-CDMA, Multi Carrier CDMAe. Convergence of Voice, Video, Dataf. Integration of wireless and cellularg. Location based services (Find ATMs etc) 3. Wireless4. Satellitea. Satellite is a big microwave repeater in the sky. A transponder picks signals, amplifies them, and transmits them back to earth. b. Satellites are placed in Geo Stationary orbits but are expensive to launchc. New low orbit satellites consume less power and can pick signals from weak transponders also. Uses include XM radio, dish, GM onstar.5. GPS a. uses a constellation of 24 well spaced satellites that orbit the earthb. http://www8.garmin.com/aboutGPS/c. Accuracy 10-100 meterd. Owned and operated by DOD6. Trendsa. Wi-fi on airplanes (uses transmitters facing upwards instead downwards)b. Restaurants, hospitals, airportsc. WiMaxd. RFIDe. Social Networkingf. Twitterg. Mobile
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